Dark matter physics in dark SU(2) gauge symmetry with non-Abelian kinetic mixing
Abstract
We investigate a model of dark sector based on non-Abelian SU(2)D gauge symmetry. This dark gauge symmetry is broken into discrete Z2 via vacuum expectation values of two real triplet scalars, and an SU(2)D doublet Dirac fermion becomes Z2-odd particles whose lighter component makes stable dark matter candidate. The standard model and dark sector can be connected via the scalar mixing and the gauge kinetic mixing generated by higher dimensional operators. We then discuss relic density of dark matter and implications to collider physics in the model. The most unique signatures of this model at the LHC would be the dark scalar (1(')) productions where it subsequently decays into : (1) a fermionic dark matter (l) and a heavy dark fermion (h) pair, 1(') l h( h l) , followed by h decays into l and non-Abelian dark gauge bosons (Xi's) which decays into SM fermion pair fSM fSM resulting in the reaction p p → 1(') → h l ( l h) fSM fSM l l , (2) a pair of Xi's followed by Xi decays into a DM pair or the SM fermions resulting in the reaction, p p → 1(') → Xi Xi → l l fSM fSM or even number of fSM fSM pairs.